Bsi bs en 45510 2 5 2002

BS EN
45510-2-5:2002

BRITISH STANDARD

Guide for procurement
of power station
equipment —
Part 2-5: Electrical equipment — Motors

The European Standard EN 45510-2-5:2002 has the status of a
British Standard

ICS 27.100; 29.160.30

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BS EN 45510-2-5:2002

National foreword
This British Standard is the official English language version of
EN 45510-2-5:2002.
The UK participation in its preparation was entrusted to Technical Committee
E/-/20, Power engineering steering committee, which has the responsibility to:
—

aid enquirers to understand the text;

—

present to the responsible international/European committee any
enquiries on the interpretation, or proposals for change, and keep the
UK interests informed;
monitor related international and European developments and
promulgate them in the UK.

—

A list of organizations represented on this committee can be obtained on
request to its secretary.

Cross-references

The British Standards which implement international or European
publications referred to in this document may be found in the BSI Catalogue
under the section entitled “International Standards Correspondence Index”, or
by using the “Search” facility of the BSI Electronic Catalogue or of British
Standards Online.
This publication does not purport to include all the necessary provisions of a
contract. Users are responsible for its correct application.

Compliance with a British Standard does not of itself confer immunity
from legal obligations.

This British Standard, having
been prepared under the
direction of the Engineering
Sector Policy and Strategy
Committee, was published
under the authority of the
Standards Policy and Strategy
Committee on
26 September 2002

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page,
pages 2 to 31 and a back cover.
The BSI copyright date displayed in this document indicates when the
document was last issued.

Amendments issued since publication
Amd. No.
© BSI 26 September 2002

ISBN 0 580 40471 4

Date

Comments


EUROPEAN STANDARD

EN 4551 0-2-5

NORME EUROPÉENNE
EUROPÄISCHE NORM

August 2002

ICS 27.1 00; 29.1 60.30

English version

Guide for procurement of power station equipment
Part 2-5: Electrical equipment Motors
Guide pour l'acquisition d'équipements
destinés aux centrales de production
d'électricité
Partie 2-5: Equipements électriques Moteurs

Leitfaden für die Beschaffung von
Ausrüstungen für Kraftwerke
Teil 2-5: Elektrische Ausrüstung Motoren

This European Standard was approved by CEN and CENELEC on 2001 -03-06.
CEN and CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
and bibliographical references concerning such national standards may be obtained on application to the CENEELEC
Central Secretariat or to any CEN or CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN or CENELEC member into its own language and notified to the
CENELEC Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France,
Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and United Kingdom.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway,
Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CEN Management Centre:
rue de Stassart, 36 B-1 050 Brussels
© 2002 CEN/CENELEC - All rights of exploitation in any form and by any means reserved
worldwide for CEN national members and for CENELEC members.

CENELEC Central Secretariat:
rue de Stassart, 35 B-1 050 Brussels

Ref. No. EN 4551 0-2-5:2002 E

EN 4551 0-2-5:2002

-2-

Contents
Foreword ......................................................................................................................................... 4
1

Scope .................................................................................................................................. 6

2

Normative references ......................................................................................................... 6

3

Definitions ......................................................................................................................... 7

3.1
3.2
3.3

Organisational terms ......................................................................................................... 7
Technical terms .................................................................................................................. 8
General terms .................................................................................................................... 8

4
4.1
4.2

4.3
4.4
4.5
4.6
4.7
4.8
4.9

Brief overall project description ........................................................................................ 9
Role and organisation of purchaser ................................................................................. 9
Site location ....................................................................................................................... 9
Equipment task ................................................................................................................ 1 0
Equipment to be purchased ............................................................................................ 1 0
Control and instrumentation ........................................................................................... 1 0
Electrical supplies and other services ............................................................................ 1 0
Other interfaces ................................................................................................................ 1 1
Project programme .......................................................................................................... 1 1
Equipment identification systems ................................................................................... 1 1

5

Extent of supply ............................................................................................................... 1 1

6

Terminal points ................................................................................................................ 1 2

7
7.1
7.2

7.3
7.4
7.5
7.6
7.7

Operational requirements ................................................................................................
Operating environment ....................................................................................................
Manning levels .................................................................................................................
Normal operation .............................................................................................................
Operating hours ...............................................................................................................
Start-up and shut-down ...................................................................................................
Abnormal conditions .......................................................................................................
Further operational requirements ...................................................................................

8
8.1
8.2

Life expectancy ................................................................................................................ 1 4
Design life ......................................................................................................................... 1 4
Components requiring periodic maintenance ................................................................ 1 4

9
9.1
9.2
9.3
9.4
9.5
9.6

Performance requirements ..............................................................................................
Duty ...................................................................................................................................
Performance .....................................................................................................................
Equipment margins ..........................................................................................................
Availability ........................................................................................................................
Levels of component redundancy...................................................................................
Further performance requirements .................................................................................

14
14
15
16
16
17
17

10
1 0.1
1 0.2
1 0.3
1 0.4
1 0.5
1 0.6

Design and fabrication .....................................................................................................
Specific equipment features ............................................................................................
Design justification ..........................................................................................................
Material selection .............................................................................................................
Safety ................................................................................................................................

Interchangeability ............................................................................................................
Fabrication methods ........................................................................................................

17
17
21
21
21
22
22

13
13
13
13
13
13
13
14


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EN 4551 0-2-5:2002

11
1 1 .1
1 1 .2
1 1 .3
1 1 .4

1 1 .5
1 1 .6
1 1 .7
1 1 .8

Maintenance requirements ..............................................................................................
Planned maintenance ......................................................................................................
Personnel safety...............................................................................................................
Requirements for access .................................................................................................
Lifting requirements .........................................................................................................
Special tools .....................................................................................................................
Test equipment ................................................................................................................
Spare parts strategy .........................................................................................................
Special precautions .........................................................................................................

22
22
22
23
23
23
23
23
24

12
1 2.1
1 2.2

Technical documentation requirements ......................................................................... 24

Tender documentation ..................................................................................................... 24
Contract documentation .................................................................................................. 24

13
1 3.1
1 3.2
1 3.3

Applicable legislation, regulations, standards and further requirements ....................
Legislation and regulations .............................................................................................
Standards .........................................................................................................................
Further requirements .......................................................................................................

14
1 4.1
1 4.2

Evaluation criteria ............................................................................................................ 25
General ............................................................................................................................. 25
Technical criteria .............................................................................................................. 25

15
1 5.1
1 5.2
1 5.3
1 5.4

Quality measures .............................................................................................................
General .............................................................................................................................
Approvals procedure .......................................................................................................

Inspection requirements ..................................................................................................
Non-conformity ................................................................................................................

26
26
26
26
26

16
1 6.1
1 6.2
1 6.3

Site factors .......................................................................................................................
Access ..............................................................................................................................
Facilities ...........................................................................................................................
Site specific requirements ...............................................................................................

27
27
27
27

17
1 7.1
1 7.2
1 7.3
1 7.4
1 7.5

Verification of specified performance .............................................................................
General .............................................................................................................................
Works tests .......................................................................................................................
Tests during installation and commissioning ................................................................
Technical conditions for trial run ....................................................................................
Functional and performance tests ..................................................................................

28
28
28
28
28
29

24
24
25
25

Annex A (informative) Bibliography............................................................................................. 30


EN 4551 0-2-5:2002

-4-

Foreword

This standard takes the form of a recommendation and is therefore entitled a “Guide”.

This Guide for procurement has been prepared by the CEN/CENELEC Joint Task Force Power
Engineering (JTFPE) of which the secretariat is held by the British Standards Institution.
The text of the draft was submitted to the formal vote and was approved by CEN and CENELEC as
EN 45510-2-5 on 2001-03-06.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement

(dop)

2003-03-01

- latest date by which the national standards conflicting
with the EN have to be withdrawn

(dow)

2004-04-01

This Guide for procurement has been prepared under mandates given to CEN and CENELEC by the
European Commission and the European Free Trade Association.
This Guide for procurement is a part of a series of Guides mandated to cover the procurement of power
station plant and equipment in conformity with European Procurement Directives. The Guides are:
EN 45510: Guide for procurement of power station equipment
Part 1: Common clauses
Part 2-1: Electrical equipment - Power transformers
Part 2-2: Electrical equipment - Uninterruptible power supplies
Part 2-3: Electrical equipment - Stationary batteries and chargers
Part 2-4: Electrical equipment - High power static convertors

Part 2-5: Electrical equipment - Motors
Part 2-6: Electrical equipment - Generators
Part 2-7: Electrical equipment - Switchgear and controlgear
Part 2-8: Electrical equipment - Power cables
Part 2-9: Electrical equipment - Cabling systems
Part 3-1: Boilers - Water tube boilers
Part 3-2: Boilers - Shell boilers
Part 3-3: Boilers - Boilers with fluidized bed firing
Part 4-1: Boiler auxiliaries - Equipment for reduction of dust emissions
Part 4-2: Boiler auxiliaries - Gas-air, steam-air and gas-gas heaters
Part 4-3: Boiler auxiliaries - Draught plant
Part 4-4: Boiler auxiliaries - Fuel preparation equipment
Part 4-5: Boiler auxiliaries - Coal handling and bulk storage plant
Part 4-6: Boiler auxiliaries - Flue gas desulphurization ( De-SOx) plant
Part 4-7: Boiler auxiliaries - Ash handling plant
Part 4-8: Boiler auxiliaries - Dust handling plant
Part 4-9: Boiler auxiliaries - Sootblowers
Part 4-10: Boiler auxiliaries - Flue gas denitrification (De-NOx) plant
Part 5-1: Turbines - Steam turbines
Part 5-2: Turbines - Gas turbines
Part 5-3: Turbines - Wind turbines
Part 5-4: Turbines - Hydraulic turbines, storage pumps and pump-turbines


-5-

EN 4551 0-2-5:2002

Part 6-1: Turbine auxiliaries - Deaerators
Part 6-2: Turbine auxiliaries - Feedwater heaters

Part 6-3: Turbine auxiliaries - Condenser plant
Part 6-4: Turbine auxiliaries - Pumps
Part 6-5: Turbine auxiliaries - Dry cooling systems
Part 6-6: Turbine auxiliaries - Wet and wet/dry cooling towers
Part 6-7: Turbine auxiliaries - Moisture separator reheaters
Part 6-8: Turbine auxiliaries - Cranes
Part 6-9: Turbine auxiliaries - Cooling water systems
Part 7-1: Pipework and valves - High pressure piping systems
Part 7-2: Pipework and valves - Boiler and high pressure piping valves
Part 8-1: Control and instrumentation
EN 45510-1 contains those clauses common to all the above Guides giving the provisions of a non
specific nature for use in the procurement of power station plant. EN 45510 is the
responsibility of JTFPE. The so called “common clauses”, as appropriate, also appear in italics in the
documents specific to particular equipment.

equipment

In this Guide, words in bold type indicate that they have the meaning given in the definitions, clause 3.
In this Guide, words and sentences not in italics are specific to this Guide and refer to the particular

equipment covered.


EN 4551 0-2-5:2002
1

-6-

Scope

This standard gives guidance on writing the technical specification for the procurement of motors for
use in electricity generating stations (power stations). This Guide for procurement is not applicable to
equipment for use in the nuclear reactor plant area of nuclear power stations. Other possible
applications of such equipment have not been considered in the preparation of this Guide.
This Guide covers motors within installations primarily concerned with the generation of electrical power.
However, as a complete electrical drive system is not defined in this Guide, attention is drawn to the
possible additional electrical and mechanical stresses to which the motor may be subjected e.g. by a
static AC converter/inverter. Reference should be made to IEC 60034-1 7.

The equipment covered by this Guide is defined by its function rather than design type. Therefore, the
guidance to the specification is stated in performance terms rather than being specified by a detailed
description of the equipment to be supplied.
This Guide indicates to potential purchasers how their specification should be prepared so that:
- the equipment type and capacity interfaces correctly with other elements of the systems;
- predicted performance is achieved;
- ancillary equipment is properly sized;
- reliability, availability and safety requirements are achieved;
- proper consideration is given to the evaluation process and the quality measures to be applied.
This Guide does not determine the type of specification (e.g. detailed, performance, functional) or the
extent of supply for any given contract which is normally decided on the basis of the purchaser’s project
strategy. It does not cover:
- any commercial, contractual or legal issues which are normally in separate parts of an enquiry;
- any allocation of responsibilities which are determined by the contract.
This Guide does not prescribe the arrangement of the documents in the enquiry.
NOTE As a comprehensive European environmental policy is still under preparation, this Guide does not address the environmental
implications of the equipment.

2

Normative references

This Guide for Procurement incorporates by dated or undated reference, provisions from other
publications. These normative references are cited in the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of
these publications apply to this Guide only when incorporated in it by amendment or revision. For
undated references, the latest edition of the publication referred to applies.
European Standards

EN ISO 9001
EN ISO 9002

Quality systems - Model for quality assurance in design, development,
production, installation and servicing
Quality systems - Model for quality assurance in production, installation and
servicing

EN 4551 0-2-7

Guide for procurement of power station equipment – Part 2-7: Electrical
equipment - Switchgear and controlgear

EN 4551 0-2-9 1 )

Guide for procurement of power station equipment – Part 2-9: Electrical
equipment - Cabling systems

1)

In preparation.

-7-

EN 4551 0-2-5:2002

EN 50347

General purpose three-phase induction motors having standard dimensions
and outputs - Frame numbers 56 to 31 5 and flange numbers 65 to 740

EN 60034-1

Rotating electrical machinery - Part 1 :
(IEC 60034-1 , mod.)

EN 60034-2

Rotating electrical machines - Part 2: Methods for determining losses and
efficiency of rotating electrical machinery from tests (IEC 60034-2 +
IEC 60034-2A)

EN 60034-5

Rotating electrical machines - Part 5: Classification of degrees of protection
provided by enclosures for rotating machines (IEC 60034-5, mod.)

EN 60034-6

Rotating electrical machines - Part 6: Methods of cooling rotating machinery
IEC 60034-6)

EN 60034-9

Rotating electrical machines - Part 9: Noise limits (IEC 60034-9)

EN 60034-1 2

Rotating electrical machines - Part 1 2: Starting performances of single-speed
three-phase cage induction motors for up to and including 660 V and 50 Hz
(IEC 60034-1 2, mod.)

EN 60034-1 4

Rotating electrical machines - Part 1 4: Mechanical vibration of certain
machines with shaft heights 56 mm and higher - Measurement, evaluation and
limits of the vibration severity (IEC 60034-1 4)

EN 60034-1 5

Rotating electrical machines - Part 1 5: Impulse voltage withstand levels of
rotating AC machines with form-wound stator coils (IEC 60034-1 5)

EN 60034-1 8

series Rotating electrical machines - Part 1 8: Functional evaluations of insulation
systems (IEC 60034-1 8 series)

Rating and

performances

Harmonization Documents (HD)

HD 53.8

Rotating electrical machines - Part 8: Terminal markings and direction of
rotation of rotating machines (IEC 60034-8)

HD 566

Thermal evaluation and classification of electrical insulation (IEC 60085)

HD 637

Power installations exceeding a.c. 1 kV

International Standards

IEC 60034-1 7

Rotating electrical machines - Part 1 7: Guide for the application of cage
induction motors fed from converters

IEC 60050-1 91

International electrotechnical vocabulary - Chapter 1 91 : Dependability and
Quality of Services
International electrotechnical vocabulary - Chapter 41 1 : Rotating machines

IEC 60050-41 1

3

Definitions

For the purposes of this Guide, the following definitions apply:

3.1

Organisational terms

3.1.1
purchaser

recipient of a product and/or a service provided by a supplier


EN 4551 0-2-5:2002

-8-

3.1.2
supplier

person or organisation that provides a product and/or a service to the purchaser
3.1.3
specification

document stating technical requirements of the purchaser. It may form part of an enquiry issued by a
purchaser
3.1.4

enquiry

invitation to tender issued by a purchaser. It will normally include a specification together with the
necessary contractual and commercial conditions
3.1.5
tender

offer made by a tenderer in response to an enquiry
3.1.6
tenderer

person or organisation submitting a tender for the equipment in response to the enquiry
3.1.7
site

place to which the equipment is to be delivered or where work is to be done by the supplier, together
with so much of the area surrounding as the supplier may, with the consent of the purchaser, use for
the purposes of the contract
NOTE Further definitions of useful organisational terms may be found in EN ISO 8402 (see annex A).

3.2

Technical terms

The technical terms applicable to the design, description, construction and performance of electric
motors are defined in IEC 60050-41 1 and the relevant component standards.
3.3

General terms

3.3.1
equipment

plant, component, system and/or associated service to be provided in response to the enquiry
3.3.2
conformity

fulfilment of specified requirements by a product, process or service
3.3.3
performance

obligations verified by specified tests
3.3.4
operating period

time between planned outages or maintenance periods during which the equipment is in operation
and/or does not restrict operational requirements of the power station
3.3.5
life expectancy

time period over which the equipment might be expected to operate with planned maintenance but
without replacement of a significant component. For example a rotor is a significant component


-9-

EN 4551 0-2-5:2002

3.3.6
design life

operating hours of the equipment on which design calculations are based
3.3.7
acceptability

compliance with criteria defined by the purchaser for assessing the suitability of equipment
3.3.8
equipment margins

allowance for design, fabrication or operating contingency defined in the specification. These are
separate to those normally included by the supplier for his own purposes
3.3.9
proven equipment
equipment which may be demonstrated to be similar to that offered and has operated for a sufficient

time to have demonstrated performance and availability
3.3.10
availability

as defined in IEC 60050-191
3.3.11
reliability

as defined in IEC 60050-191
3.3.12
maintainability

as defined in IEC 60050-191
4

Brief overall project description

4.1

Role and organisation of purchaser

The enquiry should define the purchaser’s role in the project, including whether the purchaser will
assume responsibility for the planning and technical coordination of the project, or whether other
organisations will be appointed to carry out all or part of this function. The enquiry should define all
organisational interfaces and the procedures to be employed for managing the contract and the site.
4.2

Site location

The specification should describe the geographical location of the site which may include surveying
points, the previous use of the site and any local features such as impact of industrial or military activities
and planning restrictions.
Where applicable, the specification should indicate site datum on specification drawings and specify
site and drawing orientation and define co-ordinate axes (x,y,z) and numbering order to ensure
consistency between suppliers of connected equipment.

Where appropriate, the specification should define the permitted ground loading, dimensional and time
restrictions on access routes up to but not including public roads or railways.
The specification should identify, where appropriate, the environment of the site in which the
equipment will operate. The following factors may normally be included if appropriate:
- climatic e.g. atmospheric pressure, annual variation of air and cooling water temperature, relative

humidity, rain fall, icing, snow, wind velocity (normal and maximum), lightning;

EN 4551 0-2-5:2002

- 10 -

- geological e.g. seismic conditions and characteristics of subsoil (e.g. caverns, gliding stratifications,
load bearing capability of subsoils);
- geographic e.g. elevation, influence of local topography and structures;
- hydrological e.g. flooding and tides.
4.3

Equipment task

The specification should describe in general terms the function, task or role of the equipment to be
purchased. e.g. whether it is part of a new power generating plant, a modification to an existing power
generating plant or replacement equipment.
Where appropriate, the specification should define the function and the known limitations, if any, in the
equipment connected to that which is being supplied so that the equipment may avoid imposing
adverse conditions or the supplier may suggest modifications to connected equipment which would

ensure satisfactory operation.
4.4

Equipment to be purchased

The specification may define the equipment type or arrangement to be purchased.
For example, the purchaser may specify:
?

synchronous or asynchronous (induction) motor.

The specification may state any preferences with regard to the extent of the supply. For example, the
Purchaser may wish to include an integral or separate bearing lubricating system.
The specification may state requirements for the type of enclosure selected, particularly if the motor is
to be installed in a hazardous area.

The specification may also define preferences for equipment types (or give information) regarding
compatibility with existing equipment, if required.
The specification should define the intended methods or local practice for maintenance, inspection and
operation.
The specification should define requirements with regard to the general appearance of the equipment
(e.g. dimensions, shape or colour) to meet local planning requirements or specific criteria, where such
requirements exist.
NOTE Attention is drawn to European, national and/or local legislation which may place restrictions in this area.

4.5

Control and instrumentation

The specification should define the general requirements for the control and instrumentation system, the
level of operator intervention allowed or required, integration with other control systems, localised control
loops, commonality and redundancy.
NOTE Guidance on the procurement of control and instrumentation systems for power stations, including advice on interfaces, can be
found in EN 45510-8-1.

4.6

Electrical supplies and other services

The specification should define the electrical supplies available for the operation of the equipment, their
voltages and frequencies, with their range of variation, phases available and, where appropriate, the

acceptable values of maximum load (kW) and short circuit level at each voltage level and the harmonic
content. Requirements for terminals and terminal boxes should be stated; these should be to a
recognised European or international standard.


- 11 -

EN 4551 0-2-5:2002

The specification should define the type and capacity of other services for the operation of the
equipment such as service fluids.
4.7

Other interfaces

The specification should define the interfaces with existing ancillary or new ancillary equipment to be
supplied under separate contracts which interact directly with the equipment.
For example, protection, metering, cabling, auxiliary electrical systems, civil works, cranage, or
temporary systems.
4.8

Project programme

The specification should describe the overall programme and timescale in which the project is to be
carried out. This may include the principal dates associated with tendering, placement of orders, access
to site, start and completion of installation, commissioning, take-over and final acceptance.
4.9

Equipment identification systems

The specification may specify the equipment identification system for use during the operating life of the
plant. If applicable to the project, a recognised European or international system should be used.
5

Extent of supply

The specification should define the extent of supply of all the equipment.
This may include the motor(s) with its main and auxiliary terminal boxes (if applicable), earth terminal,
anti-condensation heaters, temperature detectors and/or other condition monitoring devices (if
applicable).
For synchronous motors, integral field excitation systems should be included, but if a separate excitation
package is required it should be clearly stated.
For machines with oil lubricated plain bearings, the specification should state if the oil supply is to be:
- self contained (if technically possible),
- provided from a separately mounted oil conditioning unit, or
- provided from a source outside the scope of supply. In this case, the specification should state the
oil grade, temperature, viscosity and available flow rate which may be subject to agreement.
The extent of supply may also include spare parts, installation and maintenance manuals, test reports,
other specified documentation, transportation, installation and commissioning. The shaft coupling is
normally outside the scope of the motor manufacturers supply.
If the motor is to be subjected to external thrust loading, the specification should define whether a
special thrust bearing is to be included.
Unless otherwise specified or agreed the supplier should provide first fillings of all fluids to be used in
the equipment.
Consideration should also be given to the Guide for Procurement on Switchgear prEN 4551 0-2-7 where,
for example, a motor control centre or AC distribution switchgear, is required, or to the Guide for
Procurement on Cabling Systems prEN 4551 0-2-9 where, for example, local cabling is required.


EN 4551 0-2-5:2002

- 12 -

If the purchaser wishes to have a contract for control and instrumentation separate from the equipment
supply contract, the specification may require the supplier to provide information on all the necessary
interfaces. In addition provision may need to be made in the contract to ensure the availability of
information necessary to allow a satisfactory control system to be obtained. For example, this may
include a requirement for cooperation between the purchaser and supplier. Alternatively, the
specification may define the technical information on equipment characteristics to be provided by the
supplier and the programme for its delivery.
If the purchaser wishes to have a contract for electrical systems, electrical equipment, cables, etc.
separate from the equipment supply contract, the specification may require the supplier to provide
information on all the necessary interfaces (electrical loads, shaft heights, motor speeds and direction of
rotation, terminal boxes, etc.). Provision may need to be made in the contract for cooperation between
purchaser and supplier for system(s) to be developed or the specification may define the technical
information to be provided by the supplier and the programme for its delivery.
Similar provisions may be made for other services, etc.
The extent of supply may include training, technical and layout studies, requirements for cooperation with
the purchaser and/or other suppliers and information on necessary interfaces, if any.
The specification should define the requirements with regard to weather protection, the surface finish
(e.g. painting), thermal insulation, noise insulation or cladding, etc.
The specification may require that all parts of the equipment should be protected at all stages of
delivery, storage and installation. Subsequent to final manufacture all equipment items should be
protected against deterioration due to corrosion.
The specification may also define exclusions, for example civil works such as buildings, foundations,
structures and equipment obtained separately by the purchaser.
The specification may indicate the acceptability of alternative offers being included in the tender.
6

Terminal points

The specification should define the main process input and output terminal points such that the function
and performance of the equipment and its major components, e.g. as defined in the extent of supply,
may be demonstrated to meet the requirements of the purchaser.
The
no further than:

sp eci fi cati o n

?
?
?
?
?
?
?
?
?
?

should define the motor supply boundaries which should normally include but extend

the shaft end(s), with tongued and grooved or oil-pressure joint, as appropriate;
the main and auxiliary terminal boxes (including handing);
the mounting feet for horizontal foot mounted motors;
the flange(s) or skirt(s) for vertical shaft motors (some small horizontal shaft motors may be flange
mounted);
the pipe flanges for input and output of cooling water and lubricating oil as appropriate;
foundation plate (if required) together with mounting materials;
mounting and alignment plates and auxiliaries;

coupling and coupling guard;
lifting devices, including position and type;
connections to cooling and lubrication sources.


- 13 -

EN 4551 0-2-5:2002

The specification should also define terminal points for existing or proposed services, support structures
or civil works. These may, for example, include ancillary services, control and instrumentation system,
heating and ventilation systems, cranage, general access arrangements and fire fighting systems.
It may be necessary for design and analytical work to extend beyond the physical terminal points. The

specification should define such requirements, if any.
7

Operational requirements

7.1

Operating environment

The specification should describe the operating environment in which the equipment will be required to
function. Factors such as temperature, humidity, extent of weather protection, dust, vibration and
electromagnetic environment (this may include both emission and immunity requirements) should be
included for both normal and abnormal conditions by reference to the EN 60034 series of standards. The
type of installation, whether indoor or outdoor, should be stated.
The specification should also state the policy in the following operational areas:
- risks e.g. loss of electrical supplies, loss of cooling systems, dust or water ingress, explosions or

overvoltage surges;
- obligations e.g. noise limits;

- restrictions e.g. waste disposal, oil spillage.

7.2

Manning levels

The specification should define the power station manning levels where they may influence the
equipment supply.
7.3

Normal operation

The specification should define in broad terms the expected normal operation of the power station and
of the equipment.
7.4

Operating hours

The specification should define the total life time required of the power station and the equipment (e.g.
hours) and the required operating period of the equipment.
7.5

Start-up and shut-down

The
should identify specific duties of the driven plant where these could influence the
selection of motors (e.g. base load, peak load, start up/shut down requirements, standby, etc.).

sp eci fi cati o n

Refer also to 8.1 .

The specification should define the expected changeover strategy where standby equipment or
bypasses are provided.
7.6

Abnormal conditions

The specification should provide information on the known abnormal conditions to which the equipment
might be subjected. The supplier should take these into account in the design or selection of
components/materials.
The
should identify where motor operating modes may be linked to fast transfer of supply
systems and advise of any special requirements for the motors under such conditions.
s peci fi cati o n


EN 4551 0-2-5:2002

7.7

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Further operational requirements

Not applicable to this Guide.

8

Life expectancy

8.1

Design life

8.1.1 General
This should be a specific period which takes into account the anticipated operating regime and
recommended maintenance and will broadly equate to the stated operating hours (see 7.4).
The specification should define the design life of components which may be subject to periodic
replacement.
The supplier should define limitations on equipment life, if any, and these should be included in the
tender evaluation process.
8.1.2 Number of start-up and shut-down cycles
The specification should include an estimate of the number of cycles to which the equipment will be
subjected.
The
should state the number of starts required per year of the motor, the normal
distribution and any special starting distribution(s) which may occur during commissioning periods.
s p eci fi cati o n

8.1.3 Equipment for monitoring remaining life
The specification may request proposals for monitoring the remaining life of components which are
subject to fatigue, wear, erosion and/or corrosion. In some cases specific requirements may be stated.
For example:
?
?

8.2

recording of the cumulative number of motor starts,
incorporation of means to monitor motor circuits, (e.g. motor management schemes, protection
relays with communications facility).

Components requiring periodic maintenance

The specification should request the supplier to provide a schedule of components which require
periodic maintenance or replacement. This should include the frequency of these operations. This
schedule should include estimates of maintenance man-hours and cost of components. The supplier
should identify those maintenance replacement operations which require shut-down of the process more
frequently than the planned maintenance shut-downs.
9

Performance requirements

9.1

Duty

The specification should define the performance targets for the equipment at defined operating points
and at other defined conditions. These may include efficiency and margins at full load operation and
availability. The specification may also define the flexibility requirements over the full range of
operating conditions.


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EN 4551 0-2-5:2002

The specification should define the type of duty which the motor(s) has to perform in accordance with
EN 60034-1 . This should be a statement of the load(s) to which the machine is subjected, including if
applicable, starting, electric braking, no-load, rest and de-energised periods, including durations and
sequence.
The specification should state the required performance of the motor during and following specified
supply variations such as short time interruption, voltage unbalance or reduction, harmonics etc., where
these are not in accordance with EN 60034-1 .
9.2

Performance

9.2.1 General

The specification may define the operating points and other defined conditions at which the equipment
performance requirements are to be demonstrated immediately after commissioning and/or at other
points in the life of the equipment.
The specification should state the requirements for the performance of the motor during starting,
operation at rated or partial loads under specified conditions. The specification should also provide
information on the type and characteristics of the driven machine (eg. torque/speed profile, moment of
inertia, etc.).
9.2.2 Starting conditions
The specification should provide information on:
? Frequency of starting:
?
?

number of successive starts required under the specified conditions of load, torque, inertia and
supply,
acceptable interval between starting sequences.

? Minimum voltage during starting:
?

minimum value of voltage at the motor terminals during starting.

? Starting characteristics of cage induction and synchronous motors:
?
?
?

method of starting,
maximum permitted starting current and/or kVA,
locked rotor and starting torque.

? Restart from any speed:
?
?

assumptions to be applied to the voltage levels and times applicable, following a system
disturbance resulting in a temporary loss of supply for a defined period,
maximum permitted reacceleration time.

Attention is drawn to EN 60034-1 and to EN 60034-1 2 for machines with a rated supply voltage of 690
volts or less.
9.2.3 Rated load conditions
Motors should operate within the supply variations identified in 9.1 without prejudicial overheating.
The specification should state the time period for operating at rated frequency and load with a defined
reduction in voltage. The supplier should state the resulting heating in conformity with EN 60034-1 and
evaluate the reliability.

EN 4551 0-2-5:2002

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The specification may state the heating classes to be applied for the planned operational loads.
The method of determining efficiency should be one of the methods described in EN 60034-2. In the
absence of a specific request, the summation of losses method should be assumed.
9.2.4 Thermal performance
The specification should specify the minimum thermal class of insulation (e.g. Class B or F) and state
the permitted temperature rise of the windings. The temperature rises should be selected and
determined with reference to EN 60034-1 .
The specification may also require temperature rises lower than those corresponding to the selected
thermal class (eg. Class B temperature rise with Class F insulation system).
In those applications where the motor temperature may be appreciably affected by conducted or radiated
heat, the conditions should be stated in the specification and appropriate temperature rises agreed with
the supplier.
9.2.5 Mechanical performance
? Vibration levels:
?

the permitted limits of vibration severity and method of measurement should be as detailed in
EN 60034-1 4 unless otherwise stated.

? Acoustic performance :
?

the specification should state the permitted acoustic performance of the motor. In the absence
of specific information, the levels and method of measurement contained in EN 60034-9 should be
assumed.

? Insulation performance :
?

the specification should indicate the value of the maximum reference voltage U m to be used in
the choice of insulation levels in accordance with EN 60034-1 ;

?

the specification should state the required time limits of motor operation with one phase
grounded either as a maximum continuous period or a cumulative period during motor lifetime.

In the absence of specific insulation performance information, the recommendations of HD 566,
EN 60034-1 and EN 60034-1 8 should be assumed.
The specification may stipulate a higher test voltage than that specified in EN 60034-1 5.
NOTE Performance tests are sometimes conducted off site and may be carried out at conditions different from the operating point.
The results may require scaling according to agreed rules.

9.3

Equipment margins

The specification should identify required equipment margins.
In the absence of specific information, the schedule of tolerances on quantities involved in the rating of
electrical machines to EN 60034-1 should be assumed.
9.4

Availability

The specification may specify availability requirements. In order to demonstrate conformity with these

requirements, the specification may request the supplier to use data on availability, reliability and
maintainability to carry out an analysis to show that the target availability will be met.


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9.5

EN 4551 0-2-5:2002

Levels of component redundancy

The specification may define requirements for component redundancy.
These requirements may provide either additional operational security or cover extremes of operating
conditions.
The supplier should only use these additional plant components in meeting performance requirements
in the conditions defined in the specification.
If the specification does not specify levels of component redundancy, the purchaser may ask the
supplier to demonstrate that the level of redundancy included is adequate to meet the availability
requirements.
9.6

Further performance requirements

Not applicable to this Guide.

10

Design and fabrication

10.1 Specific equipment features
1 0.1 .1 Materials of construction
The component parts of motors should have mechanical strength and robustness suitable for the
specified conditions of service and should be able to withstand long periods at standstill in ambient
conditions of high humidity, saline contamination and vibration.
In all cases the material combinations and fasteners should be selected to avoid electrolytic action
between them.
The casing should be protected against corrosion (e.g. by paint system) in a manner appropriate to the
environment specified in 4.2.
If the specification does not include requirements for materials and corrosion prevention, the supplier
should state the measures included.
The specification may state if any process or materials are to be excluded as a result of adverse
experience, eg. for the cage bars, short-circuiting rings, and their method of connection/locking.
1 0.1 .2 Enclosures and method of cooling
The specification should state the type of enclosure required.
Attention is drawn to EN 60034-5 for degree of protection and EN 60034-6 for methods of cooling.
In many applications and duties in power stations a minimum degree of protection of IP 54 is selected
with method of cooling IC 41 1 , IC 51 1 , IC 61 1 or IC 81 W for larger machines.
If the purchaser requires machines with "weather protected" degree of protection, e.g. IPW24, the
operating environment should be fully described.
The specification should state the type of drain device required for condensate.
1 0.1 .3 Heat exchangers (where fitted)
The specification may state the type and position of the heat exchangers in all cases except for motors
with IC 41 1 cooling, ie. Totally Enclosed Fan Ventilated (TEFV) ribbed frame machines.


EN 4551 0-2-5:2002

- 18 -

The specification may state the features required for the type of heat exchanger selected.
? Air-cooled heat exchangers:
?

the specification may state the design margin to be included in the design to allow for fouling of
cooling tubes or ducts under service conditions.

?

any requirement for in-situ or on-load cleaning of cooling tubes or ducts should be stated together
with any requirement for heat exchanger instrumentation (thermometers etc.)

?

the supplier may be asked to demonstrate the method employed to avoid electrolytic corrosion
between heat exchanger components and between the heat exchanger and the frame or air ducts.

? Water-cooled heat exchangers:
?

the specification should advise the cooling water temperature, pressure, volume and analysis in
order to avoid excessive fouling and corrosion due to electrolytic action. The purchaser may
specify the materials of the heat exchanger;

?

the required or preferred position of the heat exchanger should be stated together with any
requirements for spray baffles and water catchment;

?

if emergency doors are required permitting running with method of cooling IC 01 and degree of
protection IP22, this should be clearly stated;

?
?

the relative positions of the water inlet and outlet flanges and heat exchanger instrumentation
should be stated (including leakage detector if fitted);
the specification should state any requirements for leakage detectors/alarm sensors.

1 0.1 .4 Shafts
The specification should state the requirements for shaft end tapping. If requested, data and drawings
required for torsional vibrational analysis should be provided by the supplier.
1 0.1 .5 Bearings
The specification should state the requirements for bearings and lubrication taking account of, but not
being limited to:
? load limit/limit speed;
? bearing L1 0 life;
? insulation requirements;
? pressure grease relief features;
? shock pulse monitoring points;
? oil conditioning;
? instrumentation;
? regreasing intervals;
? type of grease nipple;
? run-down features;
? anti-seizure performance and redundancy of oil supply;
? horizontal and vertical thrusts;
? type and position of thrust bearings, if any.